Offset-web mechanism for printing-presses.



1. 1. WALSER & H. FANKBONER.

OFFSET WEB MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED JUNE 5.19I7- e 00 1 m 3 2 r w 1 04 v 4 z H H 6 w @4 n m H mm a M ewv L nu 5, Q 4 a w 1T. .16 1

J. J. WALSER & H. FANKBONER.

OFFSET WEB MECHANISM FOR PRINTING PRES SES.

APPLICATION FILED UNE 5.1917.

1 ,284:,501 Patented Nov. 12, 1918.

4 SHEETSSHEEI 2.

1.]. WALSER & H. FANKBONER.

OFFSET WEB MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED JUNE 5.1917.

1 84,501 Patented Nov. 12,1918.

4 SHEETSSHEEI 3.

: "mu-nufumlmumuI I 187\ I I 135 r I I 135 I I I 134 I I FE I E I I 1.1. WALSER & H. FANKBONER.

OFFSET WEB MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED JUNE 5,1917.

Patented Nov. 12, 1918.

4 SHEETS-SHEEI 4- q I I I I I I l i I I l I I I .J

24/1 in ass,

S: PATET OFFIG JOSEPH J. VVALSER AND HARLAND FANKBONEB, OF CHICAGO, ILLINOIS, ASSIGNORS TO THE GOSS PRINTING PRESS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION ILLINOIS.

OFFSET-WEB MECHANISM FOR PRINTING-PRESSES.

Specification of Letters Patent.

Patented Nov. 12. 31 918.

T 0 all whom it may concern Be it known that we. Josnrn J. VALSER and HARLAXD Faxnnoxnn, citizens of the ll nited States, and residents of Chicago, in the county of Cook, State of Illinois. have invented certain new and useful Improvements in Offsetob Mechanisms for Printbig-Presses, of which the following is a specification, reference being had to the accon'ipanying drawings.

T his invention relates to offset web mechanisms for printing presses and it has for its principal object the provision of new and improved means for effecting a rapid rewinding of the offset web. It is another object of our invention to provide an arrangement of parts whereby power is automatically applied for rewinding the offset web whenever at any time the operation of the press is suspended temporarily, means being provided serving to automatically cut ofl' the power when the rewinding is completed. lt is another obj ect. of our invention to provide means which shall serve to stop the operasuch mechanisms being. arranged and connected together so as to provide for each section the several advantages sought to be attained without at the same time duplicating all of the parts for each section.

It is another object of our invention to provide, in a mechanism of the character described, for moving the impression cylinder, about which the offset web passes, out of operative position relative to the form cylinder whenever the press is stopped, thus relieving the pinchinp of the webs between said cylinders and providing for the desired slack in the web being printed so as to render the offset web capable of being easily moved backward relative to the printing web for the rewinding operation. It is another object of our invention to provide that the impression cylinder shall be moved back into operative position relative to the form cylinder when the rewinding operation completed or brought to a stop preparatory for a further run of the press.

It is another object of our invention to provide an ar angement of means for automatically stopping the operation of the press whenever the ofi'set web breaks, such breakage of the offset web being adapted also to prevent an application of power for rewinding such web. It is another object of our invention to provide an arrangement of means for automatically stopping the operation of the parts when the offset web is broken during the rewinding operation. It is another object to provide in a press havingra phirality of sections each equipped with our improved mechanism, that when the press is stopped by the breakage of one of the offset. webs only the rewinding power device for the broken web shall be kept out of opera-- tion, the rewinding mechanisms of the remaining offset webs being adapted to operate normally without being affected by the breakage of the one web. I

It is another object of our invention to provide, in connection with a running web, means controlled by the tension of the web for alternatively applying power for either braking the web or for assisting in forwardinp, the web as the tension of the web departs from the normal desired value. It is another object of our invention to provide a system of brakes in connection with the power transmission mechanism, together with means for throwing such brakes into and out of operation in certain predetermined relationships, means being provided preferably for shifting the connections of the brakes automatically to correspond with the changing condition of the power transmission mechanism. It is still another object of our invention to improve mechanisms of this type in sundry details hereinafter pointed out. The preferred means by which we have. accomplished our several objects are illustrated in the drawings and. are hereina tier specifically described. That which we. believe to be new and desire to cover by this application is set forth in the claims.

In the drawings:

Figure 1 is a side view of a portion of a. pr equipped with our improved. web cam trolling mechanism, the electrical connections being omitted for the sake of clearness of illustration;

Fig. 2 is a top view of the parts shown in Fig. 1;

Fig. 3 is a detailed View, partly in section, taken substantially on line 3-3 of Fig. 1;

Fig. l is a detailed view, partly in section, taken substantially on line 4'1 of Fig. 1;

Fig. 5 is a fragmentary view showing a portion of the parts illustrated in Fig. 4, but in a changed position;

Fig. 6 is a diagrammatic view showing the form of electrical connections for the apparatus shown in Fig. 1, only such parts of that apparatus being shown in detail as are essential to an understanding of the relation of the parts; and

Fig. 7 is a diagrammatic view showing the preferred form of electrical connections for a plurality of cooperating press sections such as that shown in part in Fig. 1.

Referring now to Figs. 1 to 5,15 indicates the frame of a printing press having revo' lubly mounted therein a cylinder 16 by which one side of a web 17 is rinted as the web passes upward between t e cylinder 16 and an impression cylinder 18 in operative relation thereto. In the construction illustrated, the cylinder 16 is a form cylinder provided with a plurality of printing plates 19 of any suitable type. In the construction shown the cylinder 18 is supported in position in the framework by a shaft 20 which is jou rnaled in eccentrics 21 whereby the cylinder can be moved into and out of operative position relative to the cylinder 16. The eccentrics 21 are adapted to e turned for adjusting the position of the vlinder 18 by means of arms 22 depending f1 om the eccentrics, such arms being adapted to be turned in unison by means of links 23-21 connected at their rear ends to the lower ends of arms 25-26, respectively. which are fixedly mounted upon a rock-shaft 27 extending transversely of the framework. As is shown in Fig. 1, the arm 25 extends upward beyond the rock-shaft 27 for the purposes hereinafter set forth. A heavy compression spring 28 mounted upon the link 23 bears at one end against a lug 29 carried by the frame 15 and at its other end against a collar 30 fixedly mounted upon said link, such spring being adapted normally to hold the impression cylinder 18 yieldingly in operative position relative to the cylinder 16.

An offset web 31 is maintained in position and kept in suitable tension by having its end portions wound upon suitable reels or spindles 3233, a short intermediate portion being threaded about the impression cylinder 18. Means is provided for moving the web forward during the printing operation at the same surface speed as that of the web 17 being printed upon, this result being attained by having the forward web roll 31 rest upon driving rollers 3536 which are driven as hereinafter described for rotating the roll 34 in clockwise direction in Fig. 1 for winding up the web 31 thereon. In order to keep the roll 3% in proper position relative to the driving rollers 3536 the spindle 32 is journaled in slide-blocks 37 which are slidable vertically upon suitable guides 38 rising from the framework 15. The rear web roll 39 likewise rests upon driving rollers l0l1 which are driven as hereinafter described for rotating the roll 39 in clockwise direction for rewinding the offset web 31. To this end the spindle 33 is journaled in slide-blocks 12 which are slidable vertically upon guides 43 rising from the framework 15.

The means for driving the rollers 35-36 comprises gears 4H5 fixedly connected with said rollers (see Fig. 2), the gears 4H5 being in mesh with a gear 46 (see Fig. 1) mounted upon a short shaft 17 which is driven through the medium of a bevel gear 48 meshing with a bevel gear 49 fixedly mounted upon a longitudinally-extending shaft 50. The shaft 50 in turn is driven in proper timed relation to the speed of operation of the press by means of any suitable train of mechanism cooperating with a gear 51 mounted upon said shaft and adapted to be fixedly connected therewith by means of a clutch mechanism 52 of any suitable type. The clutch 52 is adapted to be thrown into and .out of operative clutching relationship by means of a yoke 53 carried by the upper end portion of the arm or lever 25. As will be appreciated from an inspection of Fig. 1, the arrangement is such that when the lever or arm 25 is given a stroke in counterclockwise direction in said figure for carrying the impression cylinder 18 out of operative position relative to the form cylinder 16 the clutch 52 is thrown out of operation so .as to permit the gear 51 to rotate with the press without causing a corresponding rotation of the shaft 50 and the forwarding rolls 353G. lVhen the impression cylinder 18 is again moved into operative position by a clockwise rotary movement of the arm or lever 25, the

clutch 52 is moved into operative relationship so as to cause the desired rotation of the rollers 3536 for forwarding the offset web 31 past the impression cylinder 18.

The rollers 40-11 are adapted to be driven for rewinding the offset web 31 upon the spindle 33 through the medium of gears which are rigidly connected with said rollers respectively so as to rotate therewith. The gears (see F ig. 2) mesh with a gear 56 fixedly mounted upon a short shaft 57 which is driven through themedium of a bevel gear 58 fixedly mounted thereon which in turn is driven by a bevel gear 59 mounted upon a longitudinally-extending shaft 60. The shaft 60 is driven by means of a gear 61 which is adapted to be fixedly connected with said shaft through the medium of a clutch 62 of any suitable type. The gear 61 meshes with the driving pinion 63 of an electric motor 64 which is adapted to be thrown into operation by the means hereinafter described when it is desired to rewind the offset web 31 or a part thereof, the motor being of any suitable type adapted to rewind the offset web at the desired high rate of speed. The clutch 62 is adapted to be thrown into operation by means of a lever 65 the upper end of which is in operative engagement with said clutch as is shown in Fig. 1. The lever 65 is connected with the arm or lever 25 by means of a link 66, the construction being such that the clutch 62 is thrown into operation as is shown in Fig. 1 when the clutch 52 is thrown out of operation.

Automatically-acting means is provided for operating the levers 25 and 65 in unison. This means comprises the spring 28 which is adapted to swing the levers 65 and 25 in clockwise direction in Fig. l and other means operating against the action of the spring 28 for moving the levers in the opposite direction into the position shown in Fig. 1. This last-named means acting in opposition to the spring 28 comprises a lever 67 which is adapted to be operatively connected with the lever 65 by means of a latch arm 68 pivotally connected with the lever 65 adapted to have operative engagement with a lug'69 extending from the side of the lever 67. A spring 70 connected with the latch arm-68 serves to hold the arm 68 yieldingly in its uppermost position s6 as to insure engage-- ment of the latch or hook 71 of said latch arm with the lug 69 as is shown in Fig. 1. The means for swinging the lever 67 toward the left in Fig. 1 for moving the levers 65 and 25 in counterclockwise direction in said figure comprises a cam 72 fixedly connected with the gear 61 and a roller 73 mounted upon the upper end of the lever 67 (see Fig.

2) and adapted to engage the operative face of the cam 7. A spring 74 holds the lever 67 yieldingly swung toward the right to the limit of its movement in Fig. 1 so as to insure engagement of the roller 73 with the cam 72. XVith the levers 25, 65 and 67 in posit-ion at the limit of their movement in clockwise direction in Fig. 1, and with the latch arm 68 held down against the'action of the spring 70 out of contact with the lug 69, any rotation of the gear 61 and the cam 72 will have no effect other than to cause the lever 67 to swing back and forth. .VVhen, however, the spring 70 is permitted to raise the latch arm 68 into the position shown in Fig. l, the next following complete stroke of the lever 67 toward the left in said figure serves to carry the latch arm 68 toward the left, throwing the clutch 62 into operation and the clutch 52 out of operation against the action of the spring 28. When the lever 67 reaches the limit of its movement to the left in Fig. 1 to the position shown in said figure a latch arm 75 is brought into operative engagementwith a lug 76 extending from the inner face of the lever 67 see Fig. 3) serving to hold the lever 67 in position against the action of the spring 28. Aspring 77 connected with the latch arm 75 serves normally to hold the latch arm 75 in raised position so as to cause operative engagement sired by the action of the solenoid 81 in which the core is mounted. The weight of the head 79 and the core 80 is such as to move the latch arms 68 and 75 downward out of engagement with the lugs carried by the lever 67 whenever the electric circuit through the solenoid 81 is broken so as to permit the head 79 to moveinto contact with such latch arms. With the parts in the position shown in Fig. l, in which the head 79 is in its uppermost position out of contact with the latch arms 68-75, a downward movement of the head 79, serves to release the latch arms from the lever 67, permitting the spring 28 to move the levers 25 and 65 in clockwise direction in said figure. This movement serves to carry the latch arm 68 toward the right in said Fig. 1 so as to bring its free end into contact with the end of a pivotally mounted arm 82 which thereupon serves in connection with the spring 28 for holding the levers 25 and 65 moved to the limit of their motion in clockwise di-. rection in Fig. 1. The arm 82 is held yieldingly in uppermost position by means f a spring 83 which is adapted to yield for premitting the downward movement of the latch arm 68 when the weighted head 79 descends thereon. As soon as the arm 68 has then moved to the right so as to clear the end of the arm 82, the spring 83 serves to bring the arm 82 into operative position for preventing thereturn movementof the latch arm 68. A pin 84: is adapted to limit necessity for opening the switch 14A. or an one of the switches 148 upon the automatic opening of the switches A and 13 upon the breakage of one of the webs 31. \Ve have shown the use of the various switches in connection with circuits which are assumed to be both motor-stopping and motor-starting circuits, inasmuch as we are enabled thus to illustrate the principles of operation without the necessity for showing complete complicated systems involving separate stopping and starting circuits. The controllers 137 in. the systems of electrical connections shown are to be of any appropriate tvpe, either mechanical or electrical, serving upon the opening of the circuit 134? to stop the main press motor and serving upon the sul sequent closing of the circuit 13f to again start the main press motor.

\Vhat we c'lain'i as our invention and desire to secure by Letters Patent, is

1. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing operation, and means for drawing said offsetweb in the opposite direction, said lastnamed means being operable independent of the means for driving the printing couple.

2. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said first-named web is brought into contact during the printing operation, means for advancing said offset web at the same surface speed as that of the web being printed, and means for drawin said offset web in the opposite direction, said last-named means being operable independent of the means for driving the printing couple.

3. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for winding up said offset web as it advances in the printing operation. and means for drawing said offset web in the opposite direction, said last-named means being operable independent of the means for driving the printing couple.

f. In a printing press. the combination of a printing couple by which a web is printed. an offset web with which said first-named web is brought into contact during the printing operation. means for winding up said offset web as it advances through the press, and means for drawing said offset web backward past said printing couple, said last named means being operable independent of the means for driving the printing couple.

In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset Web in the printing operation, means for moving the impression member and the form member of said printing couple out of operative position relative to each other, and means for drawing said offset web in the opposite direction, said last-named means being operable independent of the means for driving the printing couple.

(5. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing operation, means for moving the impression member and the form member of said printing couple out of operative position relative to each other, and means automatically thrown into operation when the members of said printing couple are thrown out of operative position relative to each other for drawing said offset web in the opposite direction.

7. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for moving the impression member and the form member of said printing couple out of operative position relative to each other, and means adapted to act automatically when the impression member and the form menr ber of said printing couple are moved out of operative position relative to each other for throwing out of operation said web-advancing means.

8. In a printing press, the combination of. a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing operation, means for moving the impression member and the form member of said printing couple into and out of operative position relative to each other. and means adapted to act automatically when said members are moved into operative position for throwing into operation said web advancing means.

5'). In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said first-named web is brought into contact as it passes through said printing couple, means for moving the impression member of said printing couple out of operative position relative to the form member. and means for drawing said offset web backward through said printing couple when the impression member has been moved out of operative position.

10. In a printing press, the combination of a printing couple. an offset web threaded through said printing couple, means for advancing said offset web in the printing operation, and means adapted to act automatically when the press stops for drawing said offset web in the opposite direction.

11. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said first-named web is brought into contact during the printily be provided for supporting the roller 103 in its raised position during the printing operation.

The shafts 50 and 60 are provided with heads 109110, respectively, embraced by brakes 111-112 similar to the brake 107. Each of the brakes 111112 is provided with operating mechanism similar to that described in connection with the brake 107 comprising a pin 108, bell-crank lever 106, a link 105, and a rod 102. The rod 102 of the brake 111 is provided with a roller 113 which is adapted to be engaged by a lug 114 carried by the link 66, the roller 113 being thus supported in operative position upon the rewinding operation as shown in Fig. 1. a 112 is provided,

The rod 102 of the brake with a roller 115 which is-adapted to be engaged by a lug 116 when the link is moved toward the right in'Fig. l for supporting the roller 115 in operative position during the printing operation tighteningof the brake 112'upon the head 110 carried by the shaft 60. The rear. ends of the links 102 of the brakes 11l112 are pivotally connectedjto horizontally-extending arms corresponding to the arm 101 of the brake 107. These arms of the brakes 111-112, however, are fixedly connected to the shaft 117, in lieu of being' fixedly connected to the sleeve 100 upon which the arm 101 is mounted. The brakes 111112 are consequently thrown into operation by a clockwise movement of the shaft 117 in Fig.

4. As Wlll be appreciated from" an inspection of Fig. 1, only one of the rollers113; 115 is in operative position at any one time whereby a clockwise movement of the shaft 117 serves to apply only one of the brakes 111112,namely, that one Whose roller 113115 is at the moment in elevated position. Means is rovided for giving the shaft 117 a slight rocking movement in clockwise direction in F ig. 4 under certain circumstances, comprising an arm 118 depending from the shaft 117 and fixedly connected therewith; As is shown clearly in Fig. 4, the lower end of the arm 118 is inclined so as to cause an outward'movement of the arm 118 upon a downward movement of'the arm '98. \Vith the parts in the position shown in Fig.1 for the rewinding operation, when the web 31 becomes too loose, the

- heavy roller 92 supported by the web as above described descends slightly, carrying with it the arm 98, which, causes an outward movement of the arm 118. This out.- ward movement of the arm 118 causes an application of the brake 111 upon the shaft 50 tending almost instantly. to slow up the rotation of the roll 34 under the influence of the web 31, causing a corresponding tightening of that web. As soon as the web 31 is tightened, the roller 92 rises, serving 7 to be driven by for producing a out of o eration. As is shown in Figs. 6 and 7,

thistime of the arm 118 serving to apply position for a printing the brake 112 in lieu of the brake 111, inasmuch as the roller 115 is then in elevated position while the roller 113 is out of elevated operative position. This application of the brake to a prompt tightening of the web 31, followed promptly by the release of the brake'112 as wasdescribed in connection with the brake 111.

In the form of press illustrated in the drawings, the printing couple is designed an electric motor, as is illustrateddiagrammatically inFigs. 6 and 7. The controller circuit of the main press motor comprises an electric switch A of any suitable type by the opening of which t e main press motor is adaptedto be thrown shown 1n Fig. 1, the switch is provided with a horizontally extending arm 119 which is adapted to be engaged by one of the slide-blocks 42 upon which the roll 39 is mounted, the arrangement being such that when theofl'set web 31 is substantially completely unwound from the roll 39' one of the slide-blocks 42 coming in contact with the arm 119 serves to open the switch A against the action of a spring 120'which holds the switch yieldingly in-circuit-closing position. As is'also the circuit in which the motor 64 is connected comprises a switch B by the opening of which the motor 64 is thrown outof operation. The switch B is switches A and B. The inner ends of the rods 123-124 are pivotally connected to the lower ends oft-he vertically-extending arms of bell-crank levers 127128, the horizontally-extending armsof which are connected by a link 1 29 with the arm 95 which is controlled by the movement of the roller 92. As will be readily understood, when the web 31 breaks while traveling in either direction, the roller 92will immediately descend,

depending from the 75, the shaft 60 serves to cause such arm 25 is adapted to turning the bell-crank levers 12T-128, serving through the rods 123121 and the arms 12.) and 12K to open the switches A and 15 so as to throw out of operation either the motor at or the main press motor, depending upon which of such motors is at that time. in operation. hen the roller 3); is lifted again to normal position, the switches A and 15 will be again thrown into operative circuit closing position by the springs 120 and 122.

Referring now to Fig. (5 which shows a simple form of motor circuits and motor controlling ircuits, 13()131 indicate lead wires which are adapted to have electrical energy supplied thereto from any suitable source. A circuit wire 132 leading from the positive lead wire 130 is divided at the point 133 into two circuits 13+ and 135, the latter of which is connected up with the motor (31 for the operation of such motor. The circuit 131 is connected first with the poles of the switch A and at a manually operable switch 136 is divided into two parallel circuits 131 and 13%. The circuit 13 is connected in any appropriate manner with the controller 137 of the main press motor 1 37, the arrangement being such in the construction shown that when a current is passing through the circuit 131 the main press motor will be maintained in operation and that when the current is cut oti' from the circuit 131 the operation of the main press motor will cease. The circuit 131 is also connected to the poles of a switch C which is adapted to be opened by a compression spring 138 when the lever or arm is swung in countercloclnvise direction in Fig. 1. \Vhen the lever is swung in clockwise direction in Fig. 1, a lug 13$) carried by be brought into engagement with the arm of the switch (1 for closing such switch. The circuit 131" comprises a coil 11.0 the core 111 of which is connected with a switch D forming a part of the circuit 135 of the motor (3%, the arrangement being such that upon the passage of a current through the circuit 131." the switch D will be opened. The switch D and coil 140 forming parts of the circuits 135 and 134" may belocated at any suitable point. The circuits 134: and 131 are brought together again at 112 and connected by a wire 14;?) with the negative lead wire 131. The circuit 135 is connected with the coil or solenoid 81, then with the motor 61. then with the poles of the switch D. then with the poles of the switch B and then with the wire 143 leading to the negative lead Wire 131.

Vith the press in operation actuated by the main press motor. when the circuit through the controller 137 is broken. either by an automati opening of the switch A upon the exhaustion of the supply of otiset webbing upon the roll 39, or by a manual opening of the switch 136, the main press motor 1 3?. the press, and the gear 51 applying power for forwarding the web 31, are brought to rest. At the same time the circuit through the coil 110 is broken, serving to permit the switch I) to close. Upon the closing of the switch I), the circuit through the wires 132. 135 and 113 is made complete. whereupon the head 79 is lifted out of contact with the latch arms 6875 and the motor (3-1 is started into operation. This results in a commencement of the rewinding operation, as has been above described.

It the stoppage of the main press motor as above suggested was brought about by an opening of the switch A, due to the contact of the slide-block 42 with the arm 119, the switch 136 is to be opened manually within a short time to prevent the spring 120, by closing the switch A upon a very slight rise of the slide-block 42. from thus again quickly throwing into operation the main press motor. \Vhen the main press motor is stopped by an opening of the switch A, followed by a manual opening of the switch 136. the switch A will be very promptly closed by the spring 120 upon a slight elevation of the slide-block 12, but the circuit through the controller 137 will not thereafter he completed until the switch 136 is manually closed. If a stoppage of the printing operation has been necessary only by reason of the exhaustion of the supply of ott'set web upon the roll 39, the switch 136 may be closed for a resumption of the printing operation after a considerable length of the web 31 has been rewound, without waiting for the complete rewinding ot' the web 31. \Vith the rewinding mechanism automatically thrown into operation upon a stoppage of the main press motor, a plentiful supply ot the web 31 is ordinarily maintained upon the roll 39 by reason of the frequent stoppages of the. press for other reasons. It the stoppage of the press continues for any considerable length of time with the motor (31 operating the rewindin mechanism. in due time the slide-blockBt by contact with the arm 121 serves to open the switch B, thus stopping the operation of the motor (31 and permitting the head T9 to descend into contact with the latch arms (S875 serving to release such latch arms from the arm or lever (57. as above described, whereupon the spring 28 serves to change the position of the parts preparatory for a printing operation. As will be readily understood. the spring 28 by its action serves among other things to close the switch C, thus completing the circuit through this portion of the circuit 134. As will be understood. at any time during the rewinding operation the motor (3-1 can be brought to .openednianually so as to permit the roller 92 to be raised to normal operative position so as to permit a repair of the web 31 without causing a resumptlon of the operation.

Upon the completion of the repair in the web 31, the switch 144 may be again closed so as to cause a resumption of the operation which was stopped by the breakage of the web.

In Fig. 7 which shows a plurality of press sections 145, 146 and 147, each equipped with our improved offset web mechanism, parts corresponding to those above described in connection with Fig. 6 are indicated by the same characters. In this construction the circuit 135 is connected directly to the lead wire'130. being divided into circuits 135 135 and 135 each of which comprises a coil 81, a motor 64 and a switch B. The circuit 134 comprising the controller 137 of the main press motor is also connected directly with the positive lead wire 130, serving to connect the switches C of the several sections in series with the controller 137.

The circuit 134" comprising a coil 140 is also connected directly with the lead Wire 130. The circuit 134 serves to connect/in series the switches A of the several sections.

lVith the parts shown diagrammatically in Fig. 7 in position for the printing operation, upon the opening of the switch 136 or of any one of the switches A the circuit through the controller 137 is broken and the main press motor is promptly brought to a stop while at the same time the switch D is permitted to close. This results in the completion of the circuits 135*, 135 and 135 causing the three motors 64 to start into operation and serving to lift the three heads tion for a subsequent printing operation, the

actionot' the parts in each section being independent of the remaining sections. Thus the rewinding operations in the three sections may be broughtto an end all atthe same time or one at a time in any order depending upon conditions. \Vith the rewind ing operation still continuing in any one or more of the sections 1451-16-147. or with all of the sections silent by reason of a completed rewinding operation. a printing operation of the several sections may be resumed by the closing of the switch 136 in the same manner as the closing of the switch 136 inthe construction of Fig. 6 served to cause a resumption of the printing operation. It will be understood that in case the stoppage of the printingoperation was brought about by an opening of any one of the switches A, such stoppage of the printing operation would normally have been followed by a manual opening of the switch 136.

A plurality of double pole switches 148 are provided one for each of the circuits 135, 135 and 135. such switches being connected in series in the circuit 134. \Vhenever an offset web 31 of any one of the sections 145, 146 and 147 is broken serving to open the corresponding pair of switches A and B, if this occurs during the printing operation the main press motor is thrown out'of operation for stopping the press. If this occurs, however, during a rewinding operation, only the single one of the motors 64 acting upon that particular web is thrown out of operation. Upon the breakage of the web 31. the corresponding one of the switches 148 will be opened manually so as to permit of the splicing of the web 31. If the breakage of the web 31' occurs during the printing operation. prompt-1y upon the stoppage of the main press motor the rewinding mechanisms ofthe remaining press sect-ions will start into operation during the continued silence of the press. It on the other hand the breakage of a web 31 occurs during a rewinding operation, the openingof the corresponding one of the switches 148 will have no effect upon the operation of the other sections.

VVhilewe have shown and described the use of switches 144 and 148 in connection with the construction shown in Figs. (land 7 we do not wish to be restricted to the. provision of switches of this type except as hereinafter specifically claimed. In the system of wiring shown in Figs. 6 and 7, the circuits 135 are shown and described as being the main circuits for the motor 64. In practice the switch B would probably be arranged in a stopping circuit while the switch I) was preferably connected in a separate starting circuit. In like manner theswitch A would in practice probably be arranged in a stopping circuit of the main press inotor control system so that the opening of the switch A would stop the motor but the subsequent closing of the switch would not again start the main pre motor. This -would do away with the necessity of opening rangement would also do away with tlu...

necessity for opening the switch 1H or any one of the switches H8 upon the automatic opening of the switches A and B upon the breakage of one of the webs 31. \Ve have shown the use of the various switches in connection with circuits which are assumed to be both motor-stopping and motor-starting circuits, inasmuch as we are enabled thus to illustrate the principles of operation without the necessity for showing complete compli 'ated systems involving separate stopping and starting circuits. The controllers 137 in the systems of electrical connections shown are to be of any appropriate type, either mechanical or electrical, serving upon the opening of the circuit 134* to stop the main press motor and serving upon the subsequent closing of the circuit 134 to again start the main press motor.

What We claim as our invention and desire to secure by Letters Patent, is

1. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing operation, and means for drawing said offset web in the opposite direction, said lastnamed means being operable independent of the means for driving the printing couple.

2. In a printing press, the combination of a printing couple by which a Web is printed, an offset web with which said first-named web is brought into contact during the printing operation, means for advancing said offset web at the same surface speed as that of the web being printed, and means for drawing said offset web in the opposite direction, said last-named means being operable independent of the means for driving the printing couple.

3. In a printing press, the combination of a printing couple, an offset Web threaded through said printing couple, means for winding up said offset web as it advances in the printing operation, and means for drawing said offset web in the opposite direction, said last-named means being operable independent of the means for driving the printing couple.

4. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, and means for drawing said offset web backward past said printing couple, said lastnamed means being operable independent of the means for driving the printing couple.

5. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing op eration, means for moving the impression wally when the press stops for member and the form member of said printing couple out of operative position rela tive to each other, and means for drawing said offset web in the opposite direction, said last-named means being operable independent of the means for driving the printing couple.

(3. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing operation, means for moving the impression member and the form member of said printing couple out of operative position relative to each other, and means automatically thrown into operation when the members of said printing couple are thrown out of operative position relative to each other for drawing said offset Web in the opposite direction.

7. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for moving the impression member and the form member of said printing couple out of operative position relative to each other, and means adapted to act automatically when the impression member and the form mem ber of said printing couple are moved out of operative position relative to each other for throwing out of operation said Web-advancing means.

8. In a printing press, the combination of a printingcouple, an offset Web threaded through said printing couple, means for advancing said offset web in the printing operation, means for movin the impression member and the form mem er of said printing couple into and out of operative position relative to each other, and means adapted to act automatically when said members are moved into operative position for throwing into operation said web advancing means.

9. In a printing press, the combination of a printing couple by which a Web is printed, an offset web with which said first-named Web is brought into contact as it passes through said printing couple, means for moving the impression member of said printing couple out of operative position relative to the form member, and means for drawing said offset web backward through said printing couple when the impression member has been moved out of operative position.

10. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset Web in the printing operation, and means adapted to act automatidrawing said ofi'set Web in the opposite direction.

11'. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said first-named Web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, and alternative means adapted to act automatically when the press stops for drawing said ofi'set web backward past said printing couple.

12. In a printing press, the combination of a printi 11 couple, an offset web threaded through saicf printing couple,.means for advancing said offset web in the printing operation, and means for winding up the end portion of the offset web for drawing the web back through the printin couple, said last-named means bein opera is independent of the means for riving the printing couple.

13. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means for winding up one end portion of the offset web for advancing the web through the press, and means for winding up the other end portion of the offset web for drawing the web backward through the printing couple, said last-named means being operable independent of the means for driving the printing couple.

let. In a printing press, the combination of a printing couple b which a web is printed, an offset web with which said firstnamed web is brought into contact-during the printing operation, means for winding up one end portion of the offset web for advancing the web through the press at the same surface speed as that of the web being printed upon, and means for winding up the other end portion of the offset web for drawing the web backward preparatory for another advance with the web being printed, said last-named means being 0perable independent of the means for driving the printing couple.

15. In a printing press the combination of a printing couple, an offset web threaded through said printing couple and adapted to be wound back and forth from one roll to another, means for driving one roll at substantially the same surface speed as that of the printing couple for advancing the web through the press, and means for driving the other roll alternatively for rewinding the offset web, the said rewinding means being operable independent of the driving means for the printing couple.

16. In a printing press. the combination of a printing couple. an offset web threaded through said printing couple and adapted to be wound back and forth from one roll to another. a roller adapted to contact .one of the two rolls upon which the offset web is wound. means for driving said roller at substantiall the same surface speed as that of the printing couple for advancing the web through the press, and means for driving the other roll alternatively for rewinding the offset web, the said last-named means being operable independent of the driving means for the printing couple.

17. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple and adapted to be wound back and forth from one roll to another, a pair of rollers adapted to support between them one of the two rolls upon which the offset web is wound, means for driving said rollers at substantially the same surface speed as that of the printing couple for advancing the offset web through the press, and means for driving the other roll alternatively for moving the offset web in the opposite direction through said printing couple.

' 18. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means driven in timed relation to the press for winding up said offset web as it advances through the press, means for disconnecting said winding means from said press, and rewinding means for drawing said offset web backward past said printing couple, the said rewinding means being operable independent of the driving means for the printing couple.

19. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means comprising a clutch driven in timed relation to the press for winding up said offset web as it advances through the press, means for throwing said clutch out of operation, and alternative means for drawing said offset web backward past said printing couple, the said lastnamcd means being operable independent of the driving means for the printing couple.

20. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said first named web is brought into contact during the printing operation, means driven in timed relation to the press for winding up said offset web as it advances through the press. and means adapted to act auto matically when the press stops for disconnecting said winding means from said press.

21. In a printing press. the combination of a printing couple by which a web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means driven in timed relation to the press for winding up said offset web as it advances through the press, means adapted to act automatically when the press stops for disconnecting said winding means from said press, and other 7 means adapted to act automatically when a press,

said winding means has been disconnected for rewinding said offset web preparatory for another run through the printing couple. 22. In a printing press, the combination of a printing couple by which a' web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means for Winding up said offset web as it advances through the press, and rewinding means for draw ng said offset web backward past said print ng couple at a greatly increased speed relatlve to the speed of forward movement of said Web. 7

23. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means for winding up said offset web as it advances through the and electricallyoperating means adapted to act automatically when the press stops for drawing said ofiset web backward past said printing couple.

24. In a printing press, the combination of a printing couple by which a web is printed. an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, and means for stopping the operation of the press before the offset web becomes completely unwound from said ofi'set web roll.

25. In a printing press, the combination of a printing couple by which a web is printed, electrically-operating means for driving said printing couple, a circuit comprising a switch for delivering current to said driving means, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofi'set web as it advances through the press, and means adapted automatically when the ofiset web becomes substantially completely unwound from said roll to open said switch for s opping the operation of said printing couple.

26. In a printing press, the combination of a printing couple by which a web is printed. an ofi'set web roll with the Web from which said first-named web is brought into co tact during the printing operation, means for winding up said ofi'set web as it' advances through the press, means for stopping the operation of the press when the web becomes substantially completely unwound from said offset web roll, and means acting automatically when the press is stopped for rewinding the 'ofiset web.

' 27. In a printing press, the combination of a printing couple by which a web is printed, an ofiset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, means for stop ping the operation of the press when the offset web becomes substantially completely unwound from said offset web roll, means acting automatically when the press is stopped for rewinding the offset web, and means acting automatically upon a re-starting of the press to stop the rewinding operation.

28. In a printing press, the combination of a printing couple by which a web is printed, an oifset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, means for stopping the operation of the press when the ofiset web becomes substantially completely unwound from said ofiset web roll, means acting automatically when the press is stopped for rewinding the ofiset web, and means acting automatically when the web is substantially completely rewound to stop the rewinding operation.

29. In a printing press, the combination of a printing couple by which a web is printed, an ofiset web with which said firstnamed web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, rewinding means for drawing said ofiset web backward past said printing couple, and means adapted to act automatically when the ofi'set web has been substantially completely rewound to stop the rewinding operation.

30. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofi'set web as it advances through the press, and means acting automatically when the ofiset web is substantially completely unwound from said roll for throwing the impression member and the form member of said printing couple out of operative position relative to each other.

31. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it ad- ,yances through the press, and means acting automatically when the oflset web is substantially completely unwound from said roll for throwing the impression member and the form member of said printing couple out of operative position relative to each advances through the press, and means acting automatically when the offset web is substantially completely unwound from said roll for stopping the operation of the press and for throwing the impression member and the form member of said printing couple out of operative position relative to each other.

33. In a printing press, the combination of a printing couple by which a web is printed, an ofiset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, and means acting automatically when the oflset web is substantially completely unwound from said roll for stopping the operation of the press, for throwing the impression member and the form member of said printing couple out of operative position relative to each other and for rewinding the offset web preparatory for another run of the press.

34. In a printing press, the combination of a printing couple by which a web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation. means for winding up said offset web as it advances through the press. rewinding means for drawing said offset web backward past said printing couple, means for throwing the impression member and the form member of said print-- ing couple out of operative position relative to each other for permitting the rewinding operation, and means adapted to act automaticallv when said offset web is substantiallv completelv rewound to throw said impression member and said form member again into operative position relative to each other.

35. In a printing press. the combination of a printing couple. an off et web threaded through said printing couple, means for advancing said offset web in a printing operation. alternativelv-acting means for drawin said offset web in the opposite direction, and means acting automaticallv when the press is stopped to move the impression member and the form member of said printing couple out of operative position relative to each other. I

36. In a printing press. the combination of a printing couple. an offset web threaded through said printing couple, means for advancing said offset web in a printing operation. alternatively-acting means for drawing said offset web in the opposite direction, and .means acting automatically when the press is stopped to move the impression member and the form member of said printing couple out of operative position relative to each other and to draw said offset web backward relative to the printing couple preparatory for further operation of the press.

37. In a printing press, the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing operation, means for throwing the impression member and the form member of said-printing couple out of operative position relative to each other, and means adapted to act automatically when said members are moved out of operative position relative to each other for drawing the offset web backward relative .to the printing couple.

38. In a printing press. the combination of a printing couple, an offset web threaded through said printing couple, means for advancing said offset web in the printing operation. means acting automaticallv when said press stops to throw the impression member and the form member of said printing couple out of operative position relative to each other. and means acting automatically when said press is again started into operation for throwing said printing couple members a in into operative position relative to each other. i

39. In a printing press. the combinat on of a'pr nting coup e. an offset web thread d throu h sa d p inting couple. means for advancing said off et web in the printing operation. means serving when the press is out of operation for drawing the Web backward preparatory for further operation of the pr ss. and means adapted to act automaticallv when the ress is started into o eration to stop the backward movement of said web.

40. In a printing press. the combination of a printin cou le. an offset web threaded throu h said p inting couple, means for advancing said offset web in the printing operation. means for throwing the impression member and the form member of s id printing couple out of operative position relative to each other. means for drawing said offset web backward when said printing couple members are out of operative position relative to each other. means for throwing said printing couple members into oper- 'ative position relative to each other. and

means acting automaticallv when said members are thrown into operative position to throw out of operation the means for drawing the web backward.

41. In a printing press. the combination of a printing couple. an offset web threaded through said printing couple. means for advancing said offset web in the printing oper- 13 ation, means for throwing the impression member and the form member of said printing couple out of operative position relative to each other, means for drawing said offset web backward when said printing couple members are out of operative position relative to each other, and means acting automatically when said press is started again into operation to throw out of operation the means for drawing said web backward and to move said printing couple members again into operative position relative to each other.

42. In a printing press, the combination of a printing couple by which a'web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means driven in timed relation to the press for winding up said offset web as it advances through the press, power means driven independently of the press for disconnecting said winding means from said press, and rewinding means driven by said power means for drawing said offset web backward past said printing couple.

43. In a printing press, the combination of a printing couple by which a web is printed, an oifset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, and means automatically operative when said firstnamed motor is thrown out of operation for throwing said second motor into operation.

44. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said oifset web, a switch in the circuit connections of said second motor by the opening of which said second motor is thrown out of operation, and a coil in the circuit connections of said first-named mo tor adapted during the operation of said first-named motor to hold said switch open.

45. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said oifset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said ofiset web, adjustable connections between said motors and said printing couple and said web roll respectively, and means actuated by the operation of said second motor for adjusting said connections for effecting a rewinding operation.

46. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said olfset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, adjustable connections between said motors and said printing couple and said web roll respec tively, yielding means tending to hold said connections in position for a printing operation, and means actuated by the operation of said second motor against the action of said yielding means for adjusting said connections for effecting a rewinding of said oifset web.

47. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, adjustable connections between said motors and said printing couple and said web roll respectively, yielding means tending to hold said connections in position for a printing operation, and latch means for holding said connections in adjusted position against the action of said yielding means for effecting a rewinding of said offset web.

48. In a printing press, the combination of a printing couple by which a web is printed. an ofiset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, adjustable connections between said motors and said printing couple and said web roll respectively, yielding means tending to hold said connections in position for a printing operation, means actuated by the operation of said second motor against the action of said yielding means for adjusting said connections for effecting a rewinding of said offset web. and latch means for holding said connections in adjusted position.

49. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, a motor for driving said printin couple, a second motor for rewinding said offset web, adjustable connections between said motors and said printing couple and said web roll respectively, yielding means tending to hold said connections in position for a printing operation, latch means for holding said connections in adjusted position against the action of said yielding means for efiecting a rewinding of said offset web, and means automatically effective when said second motor is thrown out of operation for releasing said latch means.

50. In a printing press, the combination of a printing couple by which a web is printed, an ofiset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, adjustable connections between said motors and said printing couple and said web roll respectively, means actuated by the operation of said second motor for adjusting said connections for effecting a rewinding of said offset web, and means automatically eflective when said second motor is thrown out of operation for re-adjusting said connections for a further printing operation.

51. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, adjustable connections between said motors and said printing couple and said web roll respectively, means actuated by the operation of said second motor for adjusting said connections for effecting a rewinding of the offset web, a coil in the operating circuit of said second motor, and means adapted to act automatically when the current is cut off from said second motor and said coil to re-adjust said connections for a further printing operation. I

In a printing press, the combination of a printing couple by which a. web is printed, an offset web roll with the web from which said first-named Web is brought into contact during the printing operation, means for winding up said offset Web as it advances through the press, a motor for driving said printing couple, a second motor' for rewinding said offset web, adjustable connections between said motors and said printing couple and said web roll respectively, yielding means tending to hold said connections in position for a printing operation, latch means for holding said connections in adjusted position against the action of said yielding means for efiecting a rewinding of said offset web, a coil in the operatmg circuit of said second motor, and

a core adapted to act automatically when,

the current is cut ofl from said second motor and said coil to release said latch means.

53. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset webas it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, a clutch connecting said first-named motor with said printing couple, a second clutch operatively connecting said second motor with said offset web roll, and means actuated by said second motor for shifting said clutches for stopping the operation of said web forwardmg means and throwing into operation said rewinding means.

54;. In a printing press, the combination of a printin couple by which a web is printed, an odset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding'said offset web, a clutch connecting said first-named motor with said printing couple, a second clutch operativel connectmg said second motor with said off set web roll, yielding means tending'to holdi said clutches in position for the forwarding of said web, and means actuated. by said second motor for shifting said clutches against the action of said yielding means for stopping the operation of said web-forwarding means and throwingiinto operation said reavinding means. i

55. In a printing press, the combination of r a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printin operation, means for winding up said 0 set web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, and means automatically operative when said second motor is thrown into operation for moving the impression member and the form member of said printsaid second motor when it is thrown into operation for moving the impression memher and the form member of said printing couple out of operative position relative to each other.

57. In a printing press, the combination of a printing couple by which a web is printed, an 0 set web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, a motor for driving said printing couple, a second motor for rewinding said offset web, and means automatically operative when said first-named motor is thrown. out of operation for throwing said second. motor into operation and for moving the impression member and the form member of said printing couple out of operative position relative to each other.

58. in a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, a motor for driving said printing couple, second motor for rewinding said oiisct web, met ns automatically operative when said first-named motor is thrown out of operation for throwing said second motor into operation, and means actuated by said second motor when it is thrown into operation for moving the impression member and the form member of said printing couple out of operative position relative to each other 59. In a printing press, the combination of a printin couple b which a web 1s printed, an 0 set web rol with the web from which said first-named Web is brought into contact during the inting operation, means for winding up said offset web as it advances through the press, a motor for driving said printing couple, a second motor for rewind ing said. offset web, a clutch connecting said first-named motor with said printing couple, a second clutch operatively eonnectin said second. motor with said offset web rol and means actuated by said second motor when it is thrown into operation for sieving the impression. member and the form member of said printing couple out of operative tion relative to each other and for shij ing said clutches for stopping the operation of the web-forwarding means and throwing in? to operation said rewinding means.

' 60. in a printing press, the combination of a printing couple by which a web isprinted, an oiiset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofiset web as it advances throu h the press,-a motor for driving said priing couple, second monaaaeoi tor for rewinding said offset web, adjusta ble connections between said motors and said printing couple and said web roll respectively, yielding means tending to hold said connections in position for a printing operation, and other means cooperating wlth said yielding means for holding said connections in position for a printing operation, being adapted to be released automatically when said first-named motor is thrown out of operation.

61. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web gagement with said first-named pivotallymounted arm for moving said connections into position for a rewinding operation, said pivotally-mounted arms being adapted to be moved out of engagement with each other for a shifting of the connections when said first-named motor is thrown into operation.

62. In a printing press, the combination of a printing couple by which a web is printed, an oifset web with whichsaid firstnamed web is brought into contact during the printing operation, means for winding up said ofiset web as it advances through the press, rewindin means adapted to draw said offset web bacii ward past said printing couple, and means actuated by the breaking of said offset Web while it is being drawn backward for stopping the rewindin-g operation.

63. In a printing press, the combination of a printing couple by which" a web is printed, an offset web with which said firstnamed web is brought into contact during the printing operation, means for windin up said ofi'set web as it advances throng the press, rewinding means adapted to draw said ofi'set web backward past said printing couple, and means actuated by the breaking of said ofiset web while it is being drawn in either direction through the printing couple for throwing out of operation the means by which the web is being moved.

64. In a printing press, the combination of a printing couple by which a web is printed, an ofiset web with which said first- -named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, rewinding means adapted to draw said offset web backward past said printing for rendering ineffective both the press-driving and web-forwarding means and the webrewinding means.

65. In a printing press, the combination of a printing couple by which a web is printed, anoflset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, and means adapted to act automatically when the offset web becomes too loose to brake the rotation of said offset web roll.

66. In a printing press, the combination of a printing couple by which a Web is printed, an offset web roll with the web from which said first-named web'is brought into contact during the printing operation, means for winding up said ofi'set web as it advances through the press, rewinding means for drawing said offset web backward past said printing couple, and means adapted to act automatically when the offset web becomes too loose in the rewinding operation to brake the reverse rotation of said first-named. winding means.

67. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said ofi'set web as it advances through the press, rewinding means for drawing said oifset web backward past said printing couple, and means adapted to act automatically when the offset web becomes too loose'as driven in one direction by one driving means to brake the rotation of the other driving means being rotated in reverse direction by the pull of the web.

68. In a printing press, the combination of a printing coup e by which a web is printed. an oifset web roll with the web from which said first-named web is brought into contact during the printing operation, means for winding up said offset web as it advances through the press, rewinding means for drawing said offset web backward past said printing couple. and means adapted to -act automatically when the offset web becomes too loose in the printing operation to brake the reverse rotation of said rewinding means.

69. Ina printing press, the combination of a printing couple by which a web is printed, an oflset web roll with the web from which said first-named web is brought into contact during the printing operation, means comprising a driving shaft for windduring the printin ing up said oifset web as it advancesthrough I the press, rewinding means comprising a second shaft for drawing said offset web backward through said printing couple, and means adapted to act automatically, when the offset web becomes too loose in its movement in either direction actuated'by one of said shafts, to brake the rotation of the other of said shafts as it is rotated in reverse direction by the pull of the web.

70. In a printing press, the combination of a printing couple by which a web is printed,

an offset web roll with the web from which 4 said first-named'web is brought into contact operation, means for winding up said 0 set web as it advances through the press, rewinding means for drawing said offset web backward past said printing couple, means adapted to be appl ed for. brak ng the reverse movements of said web-moving means respectively, and

means actuated automatically when the off set web becomes too loose in its movement in either direction to apply the braking means to the revers'ely-rotating web-moving means.

71. In a printing press, the combination of a printing couple by which a web is printed, an oflset web roll with the web from which said first-named webis brought into contact during the printing operation, means comprising a driving shaft for winding up said offset web as it advances through the press,

rewinding means comprising a second shaft for drawing said ofi'set' web backward through said printing couple, brakesrnounted on said shafts respectively, a movable member by an adjustment of which said brakes are alternately'rendered inoperative, and means adapted to act automatically when the offset web becomes too loose in its movement in eitherdirection to move both of said brakes to cause an application of the brake then efi'ective.

7 2. In a printing press, the combination of a printing couple by' which a web is printed, an offset web roll withthe'web from which said first-named web is brought into contact during the printing operatlon, means com-- -means acting automatically to shift said movable memberprior to a rewinding oper ation so as to render the brake operatively applicable to the web-forwardly shaft, and means acting'automatically when the web becomes too loose during the rewinding operation to apply the brake to the web-forwardly shaft for causing a tightening of the web. a

73. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, means com prising a driving shaft for winding up said offset web as it advances through the press, rewinding means comprising a second shaft for drawing said offset web backward through said printing couple, brakes mounted on said shafts respectively, a movable member by an adjustment of which said brakes are alternately rendered inoperative, means acting automatically to shift said movable member prior to a printing operation so as to render the brake operatively applicable to the web-rewinding shaft, and means acting automatically when the web becomes too loose during the printing operation to apply the brake to the web'rcwinding shaft for causing a tightening of the web.

7%. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, a second roll upon which said offset web is wound as it advances through the press, means for rotating said rolls alternatively for drawing the web forward with the web being printed or backward for rewinding, and means adapted to act automatically when the web becomes too tight to assist in rotating the roll from which the offset web is being unwound.

75. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first'nam'ed web is brought into contact during the printing operation, a second roll upon which said offset web is wound as it advances through the press, means for rotating said first-named roll for drawing the offset web backward for rewinding, and means adapted to act automatically when the offset web becomes too tight during the rewinding operation to assist in rotating the roll from which the offset web is being unwound.

76. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, a second roll upon which said offset web is wound as it advances through the press, means for rotating said rolls alternatively for drawing the web forward with the web being printed or backward for rewinding, differential means connecting said webadvancing and said web-rewinding mechanisms adapted to permit said mecha nisms normally to run independently of each other, and means adapted to act automatically when the web becomes too tight to apply power through the difierential to the. web-driving means which is being rotated in the reverse direction by the pull of the web for relieving the tension of the web.

77. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, a second roll upon which said offset web is wound as it advances through the press, means for rotating said rolls alternatively for drawing the web forward with the web being printed or backward for rewinding, differential means connecting said web-advancing and said web-rewinding mechanisms adapted normally to permit said mechanisms to run independently of each other, a brake adapted to be applied to said difi'erential for causing said web-driving mechanisms to rotate at the same speed, and means adapted to act automatically when the web becomes too tight to apply said brake for causing independently of the pull of the web a rotation of the roll from which the web is being unwound.

78. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, a second roll upon which said offset web is wound as it advances through the press, frictionally-operating means for rotating said rolls alternatively for drawing the offset web forward with the web being printed or backward for rewinding, and means for causing the web-forwarding means which is being rotated in a reverse direction by the pull of the web to rotate at an increased speed beygond that produced by the action of the we 7 9. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, a second roll upon which saidofi'set web is wound as it advances through the press, frictionally-operating means for rotating said rolls alternatively for drawing the web forward with the web being printed or backward for rewinding, and means for causing said webdriving mechanisms to rotate at the same speed.

80. In a printing press, the combination of a printing couple by which a web is printed, an offset web roll with the web from which said first-named web is brought into contact during the printing operation, a second roll upon which said offset web is wound as it advances through the press, frictiona1ly-operating means for rotating said rolls alternatively for drawing the web forward with the web being printed or back- 

